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D( x )
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^3-1)/(3*x^2) = 0
1*x^3 = 1 // : 1
x^3 = 1
x^3 = 1 // ^ 1/3
x = 1
x = 1
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